diff options
| author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2018-03-21 20:22:35 +0100 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2018-04-16 22:18:13 +0200 |
| commit | f227e04e90fd4947b5f8442bf6e02ef6a65a6c68 (patch) | |
| tree | 2a8784a3b0ae4e77579ea8c5bcf4c6b297039e7e /Documentation/vm | |
| parent | docs/vm: page_migration: convert to ReST format (diff) | |
| download | linux-f227e04e90fd4947b5f8442bf6e02ef6a65a6c68.tar.xz linux-f227e04e90fd4947b5f8442bf6e02ef6a65a6c68.zip | |
docs/vm: page_owner: convert to ReST format
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/vm')
| -rw-r--r-- | Documentation/vm/page_owner.txt | 34 |
1 files changed, 21 insertions, 13 deletions
diff --git a/Documentation/vm/page_owner.txt b/Documentation/vm/page_owner.txt index ffff1439076a..0ed5ab8c7ab4 100644 --- a/Documentation/vm/page_owner.txt +++ b/Documentation/vm/page_owner.txt @@ -1,7 +1,11 @@ +.. _page_owner: + +================================================== page owner: Tracking about who allocated each page ------------------------------------------------------------ +================================================== -* Introduction +Introduction +============ page owner is for the tracking about who allocated each page. It can be used to debug memory leak or to find a memory hogger. @@ -34,13 +38,15 @@ not affect to allocation performance, especially if the static keys jump label patching functionality is available. Following is the kernel's code size change due to this facility. -- Without page owner +- Without page owner:: + text data bss dec hex filename - 40662 1493 644 42799 a72f mm/page_alloc.o + 40662 1493 644 42799 a72f mm/page_alloc.o + +- With page owner:: -- With page owner text data bss dec hex filename - 40892 1493 644 43029 a815 mm/page_alloc.o + 40892 1493 644 43029 a815 mm/page_alloc.o 1427 24 8 1459 5b3 mm/page_ext.o 2722 50 0 2772 ad4 mm/page_owner.o @@ -62,21 +68,23 @@ are catched and marked, although they are mostly allocated from struct page extension feature. Anyway, after that, no page is left in un-tracking state. -* Usage +Usage +===== + +1) Build user-space helper:: -1) Build user-space helper cd tools/vm make page_owner_sort -2) Enable page owner - Add "page_owner=on" to boot cmdline. +2) Enable page owner: add "page_owner=on" to boot cmdline. 3) Do the job what you want to debug -4) Analyze information from page owner +4) Analyze information from page owner:: + cat /sys/kernel/debug/page_owner > page_owner_full.txt grep -v ^PFN page_owner_full.txt > page_owner.txt ./page_owner_sort page_owner.txt sorted_page_owner.txt - See the result about who allocated each page - in the sorted_page_owner.txt. + See the result about who allocated each page + in the ``sorted_page_owner.txt``. |